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Osteoarthritis. Sometimes called degenerative joint disease or âwear and tearâ arthritis, osteoarthritis (OA) is the most common chronic condition of the joints.It occurs when the cartilage or cushion between joints breaks down leading to pain, stiffness and swelling. pain.steoarthritis. Sometimes called degenerative joint disease or âwear and tearâ arthritis, osteoarthritis (OA) is the most common chronic condition of the joints.
Osteoarthritis is a joint disease that mostly affects cartilage. Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage allows bones to glide over each other. It also helps absorb shock of movement.In osteoarthritis, the top layer of cartilage breaks down and wears away.nlike some other forms of arthritis, osteoarthritis affects only joints and not internal organs. Rheumatoid arthritis -- the second most common form of arthritis -- affects other parts of the body besides the joints.